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How fast is 0.02 mach?

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It's about one-fifteen-thousandth as fast as a bolt of Lightning.
In other words, the speed of a bolt of Lightning is 15,000 times 0.02 mach.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 290 mach when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about 0.00000002 times as fast as The Speed of Light.
In other words, 0.02 mach is 0.00000002211885680 times the speed of The Speed of Light, and the speed of The Speed of Light is 45,210,293.10 times that amount.
(C) (in a vacuum)
The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures exactly 904,205.8620 mach, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 602,803.9080 mach when passing through the glass of a typical window.
It's about 150,000,000 times as fast as Grass growing.
In other words, the speed of Grass growing is 0.00000000590 times 0.02 mach.
(for Kentucky Bluegrass, Poa pratensis) (a.k.a. Smooth Meadow grass, a.k.a. Common Meadow grass) (Summer months, ideal growing conditions)
Kentucky Bluegrass, one of the most common grasses in North America, grows about 0.000000000130 mach in the summer months under ideal conditions. When left un-mowed, Kentucky Bluegrass grows to heights of 60 to 90 cm (2 to 3 ft) and blossoms with a blue flower.